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Sand drops at the rate of 2000 kg/min. from the bottom of a hopper onto a belt conveyor moving horizontally at 250 m/min. Determine the force needed to drive the conveyor, neglecting friction.
A 72 kg man in a 5-kg chair tilts back so that all weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area with the radius of 1.0 cm, and find out the pressure exerted on the floor by eac..
A small mass m is set on the surface of a sphere, Fig. 4-51. If the coefficient of static friction is µs = 0.57, at what angle would the mass start sliding
An alpha particle approaches a 197 AU nucleus with a speed of1.5x10^7 m/s. In what direction does the nucleus recoil, and with what speed
A long thin rod of mass M = 2 kg and length L = 75 cm is free to rotate about its center as shown. Two identical masses (each of mass m = 0.853 kg) slide without friction along the rod. how fast is the rod rotating
scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. in
When a ball is thrown upward, it spends the same amount of time on the way up as the way down- as long as air resistance can be ignored. If aur resistance is taken into account, is the time on the way down the same as, greater than, or less than t..
A 3.0 kilogram object moves to the right with a speed of 2.0 m/s. Evaluate the total kinetic energy after the collision
A metallic wire has a diameter of 4.12 millimeter. When the current in the wire is 8.00 Amp, the drift velocity is 5.40 ×105 m/s. Compute the density of free electrons in the metal
A -6.0 diopter lens is held 10.0 cm from an ant that is 1.0mm high. What is the height of the image
A 56.7-µF capacitor is connected to a generator operating at a low frequency. The rms voltage of the generator is 3.88 V and is constant. at what frequency will the fuse burn out
selzer estimates the total cost of servicing the warranties will be $120,000 for 2 years. Estimate revenues earned on basis of costs incurred an estimated costs.
One billiard ball is shot east at 2.8 m/s. A second, identical billiard ball is shot west at 1.2 m/s. Estimate the speed and direction of the first ball after the collision
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